These are not patient-portable devices. They attach to an IV pole and control delivery of whatever drug is fed from the bag. They're modular, so they get mixed and matched from pole to pole (and presumably some stash on the ward) as necessary. They are not isolated; they communicate with other systems on the ward so that, for example, the nurse can come by and check on the patient when the bag is empty.
Getting access to one of these wouldn't necessarily be that hard. Go to the ER with something that will get them to give you IV fluid and you'll find yourself left alone with one of these pumps. Install a worm and over time you'll have a lot of devices at your command and perhaps have gathered a lot of information into the bargain.